Well, I can't say that I really hate any of the races, but here are a few of my pet peeves:
#1: DWARVES!
Nobody has mentioned this one, for some reason. Why is it that every dwarven PC I've ever seen has the same stereotypical weapons and armor, personality (either bloodthirsty CG or CN battlerager or noble and honorable but very gruff LG warrior), class (Fighter, Cleric, or Fighter/Cleric). I've only briefly played dwarves, but both of the ones I played were stereotype breakers. Dwarves annoy me far more than elves, to say the least. Let's see some creativity here, folks- and maybe even a female dwarf for once!
#2: HALFLINGS!
Halflings also suffer from serious stereotyping- every halfling I've ever seen in a party I've played in or DM'ed for has been either a Rogue or a Fighter/Rogue, with only one exception (one player in my game recently tried a Halfling Necromancer). Come on! Halfling clerics? Druids? Paladins? Rangers? (Unfortunately, I must say I've contributed to this- the only halflings I've ever played were a Rogue and a Fighter/Rogue)
Really, I've seen plenty of creative elven characters- yet even there, Mages and Fighter/Mages seem to be the rule (although I've also seen Paladins, Rangers, Rogues, Psychic Warriors, and Clerics, and seen them all played with very different styles). I don't mind the Dragonlancification (new word!) of Gnomes so much- I like the Tinker archetype, and it lends itself to many different classes in different ways (Fighter, Rogue, Wizard, and Sorcerer tinkers all have different flavors to them).